<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>flex布局</title>
    <!-- Latest compiled and minified CSS -->
    <link rel="stylesheet" href="./flex.css">
    
</head>
<body>
    <div class="flexcontainer">
        <div class="A">A</div>
        <div class="B">B</div>
        <div class="C">C</div>
    </div>
</body>
</html>